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import org.apache.commons.digester.Digester;
import org.xml.sax.SAXException;

import org.apache.lucene.util.Version;
import java.util.ArrayList;
import java.util.List;

import java.io.File;
import java.io.IOException;
import java.io.FileNotFoundException;

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.Writer;

import java.io.OutputStreamWriter;
import java.io.FileOutputStream;


/**
  * Generates centroids given docs list in a XML file
  *
  */
  public class CentroidGenerator
{

  List<Centroid> centroids;

  public List<Centroid> getCentroids() {

    for (int i=0; i<centroids.size(); i++) {
      centroids.get(i).averageTime();
      centroids.get(i).averageLat();
      centroids.get(i).averageLng();    
    }

    return centroids;
  }

  public void nextItem(FlickrDoc flickrDoc)
  {

    if (centroids == null) {

      centroids = new ArrayList<Centroid>();

      Centroid centroid = new Centroid(flickrDoc.getTitle(), flickrDoc.getDescription(), flickrDoc.getTime(), flickrDoc.getTags(), flickrDoc.getEvent());

      if ( (flickrDoc.getLatitude() != null) && (flickrDoc.getLongitude() != null) ) {
        centroid.setLat(flickrDoc.getLatitude());
        centroid.setLng(flickrDoc.getLongitude());
      }

      centroids.add(centroid);

    } else {      

      String existing;
      Boolean merged = false;
      for (int i=0; i<centroids.size(); i++) {

        if (flickrDoc.getEvent().equals(centroids.get(i).getEvent())) {

          existing = centroids.get(i).getTitle();
          centroids.get(i).appendTitle(flickrDoc.getTitle());

          existing = centroids.get(i).getDescription();
          centroids.get(i).appendDescription(flickrDoc.getDescription());

          existing = centroids.get(i).getTime();
          centroids.get(i).appendTime(flickrDoc.getTime());

          existing = centroids.get(i).getTags();
          centroids.get(i).appendTags(flickrDoc.getTags());

          if ( (flickrDoc.getLatitude() != null) && (flickrDoc.getLongitude() != null) ) {
            centroids.get(i).appendLat(flickrDoc.getLatitude());
            centroids.get(i).appendLng(flickrDoc.getLongitude());
          }

          merged = true;
          break;
        }
      }

      if (!merged) {
        Centroid centroid = new Centroid(flickrDoc.getTitle(), flickrDoc.getDescription(), flickrDoc.getTime(), flickrDoc.getTags(), flickrDoc.getEvent());

        if ( (flickrDoc.getLatitude() != null) && (flickrDoc.getLongitude() != null) ) {
          centroid.setLat(flickrDoc.getLatitude());
          centroid.setLng(flickrDoc.getLongitude());
        }

        centroids.add(centroid);
      }
    }

  }

  /**
    * Configures Digester rules and actions, parses the XML file specified
    * as the first argument.
    *
    * @param args command line arguments
    */
    public static void main(String[] args) throws IOException, SAXException
  {

    System.out.println("Centroid Generator...");

    // instantiate Digester and disable XML validation
    Digester digester = new Digester();
    digester.setValidating(false);

    // instantiate CollectionIndexer class
    digester.addObjectCreate("collection", CentroidGenerator.class );
    // instantiate Document class
    digester.addObjectCreate("collection/doc", FlickrDoc.class );

    // set type property of Document instance when 'type' attribute is found
    //digester.addSetProperties("collection/doc",         "type", "type" );

    // set different properties of Document instance using specified methods
    digester.addCallMethod("collection/doc/id",       "setId", 0);
    digester.addCallMethod("collection/doc/title",    "setTitle", 0);
    digester.addCallMethod("collection/doc/description",       "setDescription", 0);
    digester.addCallMethod("collection/doc/time",   "setTime", 0);
    digester.addCallMethod("collection/doc/tags", "setTags", 0);
    digester.addCallMethod("collection/doc/geo/latitude",    "setLatitude", 0);
    digester.addCallMethod("collection/doc/geo/longitude",    "setLongitude", 0);      
    digester.addCallMethod("collection/doc/event",  "setEvent", 0);

    // call 'addDocument' method when the next 'collection/document' pattern is seen
    digester.addSetNext("collection/doc", "nextItem" );

    // now that rules and actions are configured, start the parsing process
    CentroidGenerator abp = (CentroidGenerator) digester.parse(new File(args[0]));

    StringBuffer contents = new StringBuffer();
    contents.append("<?xml version='1.0' encoding='utf-8'?>" + System.getProperty("line.separator"));
    contents.append("<collection>").append(System.getProperty("line.separator"));


    List<Centroid> cent = abp.getCentroids();

    for (int i=0; i<cent.size(); i++) {

      contents.append("<doc>" + System.getProperty("line.separator"));

      contents.append("<id>");
      contents.append(i);
      contents.append("</id>" + System.getProperty("line.separator"));

      contents.append("<title>");
      contents.append(cent.get(i).getTitle());
      contents.append("</title>" + System.getProperty("line.separator"));

      contents.append("<description>");
      contents.append(cent.get(i).getDescription());
      contents.append("</description>" + System.getProperty("line.separator"));

      contents.append("<time>");
      contents.append(cent.get(i).getTime());
      contents.append("</time>" + System.getProperty("line.separator"));

      contents.append("<tags>");
      contents.append(cent.get(i).getTags());
      contents.append("</tags>" + System.getProperty("line.separator"));

      contents.append("<geo>" + System.getProperty("line.separator"));

      contents.append("<lat>");
      if (cent.get(i).getLat() != null) contents.append(cent.get(i).getLat());
      contents.append("</lat>" + System.getProperty("line.separator"));

      contents.append("<lng>");
      if (cent.get(i).getLng() != null) contents.append(cent.get(i).getLng());
      contents.append("</lng>" + System.getProperty("line.separator"));

      contents.append("</geo>" + System.getProperty("line.separator"));

      contents.append("<event>");
      contents.append(cent.get(i).getEvent());
      contents.append("</event>" + System.getProperty("line.separator"));

      contents.append("</doc>" + System.getProperty("line.separator"));
    }
    contents.append("</collection>" + System.getProperty("line.separator") + System.getProperty("line.separator"));  


    Writer writer = null;

    try {
      //File fileOutput = new File("output.trectext");
      File fileOutput = new File(args[1]);  
      writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileOutput), "UTF8"));
      writer.write(contents.toString());
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (writer != null) {
          writer.close();
        }
      } catch (IOException e) {
        e.printStackTrace();
      }
    }



  }

  /**
    * Flickr structured document.
    *
    */
    public static class FlickrDoc
  {
    //private String type;
    private String id;
    private String title;
    private String description;
    private String time;
    private String tags;
    private String latitude;
    private String longitude;
    private String event;

    public void setId(String newId)
    {
      id = newId;
    }
    public String getId()
    {
      return id;
    }

    public void setTitle(String newTitle)
    {
      title = newTitle;
    }
    public String getTitle()
    {
      return title;
    }

    public void setDescription(String newDescription)
    {
      description = newDescription;
    }
    public String getDescription()
    {
      return description;
    }

    public void setTime(String newTime)
    {
      time = newTime;
    }
    public String getTime()
    {
      return time;
    }

    public void setTags(String newTags)
    {
      tags = newTags;
    }
    public String getTags()
    {
      return tags;
    }

    public void setLatitude(String newLatitude)
    {
      latitude = newLatitude;
    }
    public String getLatitude()
    {
      return latitude;
    }

    public void setLongitude(String newLongitude)
    {
      longitude = newLongitude;
    }
    public String getLongitude()
    {
      return longitude;
    }

    public void setEvent(String newEvent)
    {
      event = newEvent;
    }
    public String getEvent()
    {
      return event;
    }
  }

  public static class Centroid
  {
    private String title;
    private String description;
    private String time;
    private String tags;
    private String latitude;
    private String longitude;
    private String event;


    public Centroid(String newTitle, String newDescription, String newTime, String newTags, String newEvent) {
      title = newTitle;
      description = newDescription;
      tags = newTags;
      time = newTime;
      event = newEvent;
    }

    public void setTitle(String newTitle)
    {
      title = newTitle;
    }

    public void appendTitle(String newTitle)
    {
      title = title + " " + newTitle;
    }

    public String getTitle()
    {
      return title;
    }

    public void setDescription(String newDescription)
    {
      description = newDescription;
    }

    public void appendDescription(String newDescription)
    {
      description = description + " " + newDescription;
    }

    public String getDescription()
    {
      return description;
    }

    public void setTime(String newTime)
    {
      time = newTime;
    }

    public void appendTime(String newTime)
    {
      time = time + " " + newTime;
    }

    public void averageTime()
    {      
      String[] timeValues = time.split(" ");
      int sum = 0;
      for (int i = 0; i < timeValues.length; i++) {        
        sum = sum + Integer.parseInt(timeValues[i]);
      }
      time = Integer.toString(sum / timeValues.length);       
    }

    public String getTime()
    {
      return time;
    }

    public void setTags(String newTags)
    {
      tags = newTags;
    }

    public void appendTags(String newTags)
    {
      tags = tags + " " + newTags;
    }

    public String getTags()
    {
      return tags;
    }

    public void setLat(String newLatitude)
    {
      latitude = newLatitude;
    }

    public void appendLat(String newLatitude)
    {
      latitude = latitude + " " + newLatitude;
    }

    public void averageLat()
    {
      if (latitude!=null) {
        if (!latitude.equals("null")) {
          String[] latValues = latitude.split(" ");
          float sum = 0;
          int counter = 0;
          for (int i = 0; i < latValues.length; i++) {    
            if (!latValues[i].equals("null")) {
            sum = sum + Float.valueOf(latValues[i].trim()).floatValue();
            counter = counter +1;
          }
          }
          latitude = Float.toString(sum / (float) counter);

        }
      }               
    }

    public String getLat()
    {
      return latitude;
    }

    public void setLng(String newLongitude)
    {
      longitude = newLongitude;
    }

    public void appendLng(String newLongitude)
    {
      longitude = longitude + " " + newLongitude;
    }

    public void averageLng()
    {      
        if (longitude!=null) {
          if (!longitude.equals("null")) {
            String[] lngValues = longitude.split(" ");
            float sum = 0;
            int counter = 0;
            for (int i = 0; i < lngValues.length; i++) {    
              if (!lngValues[i].equals("null")) {
              sum = sum + Float.valueOf(lngValues[i].trim()).floatValue();
              counter = counter +1;
            }
            }
            longitude = Float.toString(sum / (float) counter);
          }
        }  
    }

    public String getLng()
    {
      return longitude;
    }

    public void setEvent(String newEvent)
    {
      event = newEvent;
    }

    public String getEvent()
    {
      return event;
    }
  }
}